import java.util.ArrayList;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

public class CallableDemo {

	public static void main(String[] args) {

		ExecutorService exec = Executors.newCachedThreadPool();
		ArrayList<Future<String>> result =new ArrayList<Future<String>>();
		for (int i = 0; i < 10; i++) {
			result.add(exec.submit(new TaskWithResult(i)));
		}
		
		for(Future<String> fs : result){
			try {
				System.out.println(fs.get());
			} catch (InterruptedException e) {
				e.printStackTrace();
			} catch (ExecutionException e) {
				e.printStackTrace();
			}finally{
				exec.shutdown();
			}
		}
		
	}

}

class TaskWithResult implements Callable<String> {

	private int id;

	public TaskWithResult(int id) {
		this.id = id;
	}

	@Override
	public String call() throws Exception {
		return "result of TaskWithResult:" + id;
	}

}
